ACME,
Electronic unit at enco:
http://www.use-enco.com/CGI/INSRIT?P...&PMPXNO=951637
Ken
There is an affordable mechanical unit also but could not find it.
Personally I like dials
Here it the mechanical,
Bulkier then the one I use and not the precision but is also $250 less money and should be fine within +/- .001 or so, which ain't shabby tolerances.
Unlike th electronic versions mechanical works on all material, not just conductive.
http://cgi.ebay.com/PRECISION-Z-AXIS...QQcmdZViewItem